User blog comment:Hayds126/The Pokémon Go “Fans”/@comment-35002745-20180529000156/@comment-32358261-20180529000436

Some think that gen 4 doesn’t exist yet and niantic are making new Pokémon designs to be gen 4 Pokémon.

When shown a darkrai some thought it was some fan art concept for gen 4 and not an official thing. People tried linking them to sites like Bulbapedia (a trusted Pokémon source) and they wouldn’t accept it because it wasn’t covered by a Pokémon go only website.